Fatigue Response of Orthotropic Bridge Deck Based on Crack Propagation Analysis
The local effects of orthotropic steel decks(OSDs)under wheel loading can be significant and fatigue behavior of adjacent details interacts with neighbouring ones.The fatigue stress in adjacent details may increase as a crack in one detail propagates,leading to an accelerated deterioration trend in the fatigue performance of the OSDs.Fatigue stress response and the assessment of performance degradation have become challenges and pressing tasks in the service of steel bridge decks.A multi-scale interactive approach was employed to assess the fatigue evolution of cracked OSDs based on existing full-scale model fatigue tests.This approach comprehensively utilized the finite element software ANSYS and Franc3D to simulate the crack propagation behavior of typical fatigue prone details in steel bridge decks,to investigate the fatigue stress response and evolution of various critical details(such as the top plate-to-U-rib weld,U-rib-to-crossbeam weld,and crossbeam hole)during the process of crack propagation.The results indicate that crack propagation has minimal impact on the local deformation(deflection)of OSDs.Different details exhibit significant variations in stress changes due to being in distinct cracking modes,and the response of crack propagation displays local characteristics,only having a moderate increasing effect on the principal tensile stress of the nearest detail.Crack propagation at the top plate-to-longitudinal rib weld junction and at the crossbeam hole significantly increases the principal tensile stress in adjacent details,potentially leading to crack initiation at those locations.These findings can serve as a reference for the assessment of fatigue performance in cracked OSDs.
orthotropic steel deckcrack propagationfatigue responseevolution of stressfatigue prone detail
万方数据
维普
